Thermal Rearrangement of 3-Hydroxy-1H,3H-quinoline-2,4-diones to 3-Acyloxy-2,3-dihydro-1H-indol-2-ones
摘要:
3-Alkyl/aryl-3-hydroxy-1H,3H-quinoline-2,4-diones (2) were transformed into isomeric 3-acyloxy-2,3-dihydro-1H-indol-2-ones (3) by thermally induced molecular rearrangement. All products were characterized by their H-1 NMR, C-13 NMR, and IR spectra.
None of these selected derivatives showed significant acute toxicity against MRC-5 cells or early signs of genotoxicity in the Vitotox™ assay at the active concentration range. The structure activity study relation provided some insight in the further favourable substitution pattern at the 4-hydroxyquinolin-2(1H)-one scaffold and finally 6-fluoro-4-hydroxy-3-phenylquinolin-2(1H)-one (38) was selected as
Methoden zur Darstellung von 4-Azido-2(1H)-chinolonen
作者:Wolfgang Stadlbauer
DOI:10.1007/bf00810876
日期:1986.11
Novel Ring Contraction of 3-Hydroxy-2,4(1<i>H</i>,3<i>H</i>)-quinolinediones in Aqueous Alkali. The First Convenient Route to 2-Hydroxyindoxyls
作者:Stanislav Kafka、Antonín Klásek、Janez Košmrlj
DOI:10.1021/jo015786d
日期:2001.9.1
Ring contraction of 3-hydroxy-2,4(1H,3H)-quinolinediones (1) in aqueous potassium hydroxide resulted in the formation of 2-hydroxyindoxyls and/or dioxindoles. The choice of N-substituent and the reaction conditions govern the chemoselectivity of the reaction. N-Phenyl-substituted derivatives 1 give 2-hydroxyindoxyls, while N-alkyl- and N-benzyl-substituted derivatives afford the corresponding dioxindols. On the basis of byproduct analysis, as well as independent experiments, the most plausible reaction mechanism is proposed.
Halogenation reactions in position 3 of quinoline-2,4-dione systems by electrophilic substitution and halogen exchange
3-Substituted 4-hydroxy-2(1 H)-quinolones 3, 5, 7 are halogenated with bromine or sulfuryl chloride to yield the quinolinediones 9 or 10. Reaction of 3, 5, 7 with chloroform gives the dichloromethyl quinolinediones 11. Halogen exchange leads from the chloro quinolinediones 10 to fluoro quinolinedones 12 and to azido quinolinediones 13. Similarly the dichloro quinolinedione 10 an reacts to the difluoro quinolinedione 14, which is reduced to the 3-fluoro-4-hydroxyquinolone 16 and reacts again with sulfuryl chloride to give the mixed 3-chloro-3-fluoroquinolinedione 15.